Condensed Matter Physics Seminar

Speaker: Eunja Kim, University of Nevada, Las Vegas

Title: Materials under extreme conditions: Insight from Theory

Refreshments available at 3:45 pm.

Date: Mon, 17 Sep 2018, 4:10 pm – 5:10 pm
Type: Seminar
Location: 1400 BPS Bldg.

Abstract:
Structural response under extreme conditions is unique in each material and can be described by thermo­dynamic variables such as energy, temperature, and pressure. Along with temperature, pressure can change the chemical bonding of materials signifi­cantly, result­ing in the formation of the new phases and/or the alter­ation of materials proper­ties, such as elec­tronic, mechan­ical, and mag­netic properties. Recent advances in high pressure research during the last decades allow us to witness the syn­thesis of new materials that are known to be ener­getically unfavor­able under ambient con­ditions, by manipu­lating the temper­ature and pressure to form less stable high pressure phases.

In this talk I will present a few inter­esting examples of the temperature and pressure induced structural trans­formations occurring in transition metals, oxides, and semi­conducting materials. Martensitic trans­formations in solids through slipping and twinning, our dis­covery of a new iron oxide compound, and a fascinating phenom­enon of the elec­tronic structural changes in semi­conductor materials such as band-gap opening and closing under pressure will be discussed.